<!doctype html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>js示例4-5-1</title>
	<script>
		var number1=2.2;
		var number2=3;
		var number3=number1*2+number2/3;
		alert(number3);
	</script>
</head>
<body>
	
</body>
</html>